http://www.urticator.net/essay/0/48.html
Might be a useful read apropos of Wei Dai's recent question:
Why are we causing [people] to think of LW in terms of identity in the first place, instead of, say, a place to learn about and discuss some interesting ideas?
The default reaction my brain (and so, generalizing from one example, I expect other brains on LW too) has to this whole program of overcoming biases is "oh cool! I'm the kind of person who overcomes biases now! That makes me so much better than all those other biased people." Successfully overcoming other biases actually makes this one a little worse. But I think I'm okay with this one as long as I'm using it to motivate myself.
"Rationalist" or "someone who overcomes biases" seems to be a smaller identity than "part of LW" (as the latter tends to be construed, by SamLL for example, as including beliefs that are merely popular around here instead of having to do with rationality). If we can't (or it would be counterproductive to) avoid adopting the former identity, it should still be possible (or sensible) to avoid adopting the latter identity.